Laminated tooth point



March 3, 1936. D. GRAHAM 2,032,875

LAMINATED TOOTH POINT March 3, 1936. Dl GRAHAM 2,032,875

LAMINATED TOOTH POINT Filed June 9, 1954 3 Sheets-Sheet 2 Mm/ to 64M/56655.- v v v l March 3, 1936. D GRAHAM LAMINATED TOOTH POINT 5 Sheets-Sheet 5 Filed June 9, 1954 iQ-6 Patented Mar.` 3, 1936 www UNITED STATES PATENT oFFlcE LAMINATED TOOTH POINT Dwight Graham, Milwaukee, `Wis., assignor to American Manganese Steel Company, Chicago Heights, Ill., a corporationof Maine Application June 9, 1934, Serial No. 729,736

7 Claims. (Cl. 37-142) This invention relates .to improvements in a laminated' dipper tooth point of the reversible and renewable type, mounted upon a tooth bas carried on a digging lip of a dipper.

'I'he usual design of a two-part dipper tooth consists of a base land a point, the point being made of a solid one-piececasting. There is a 4 tendency for the initially sharp vcutting edge of the original point.

the tooth point to wear awayin service and the cutting edge becomes increasingly bluntas the metal wears away, and; therefore, makes it necessary to discard the whole point. Various designs ofV tooth points have been proposed in an attempt to overcome this difculty but they have not been entirely satisfactory.'

Itis an object of the present invention to provide a dipper tooth point having a series of laminations keyedor welded in place' which will provide two or more cutting edges.

It 4is further an object of my invention to so proportion the laminations of the tooth point that the natural wear on the cutting edge of the to'oth will, before the point loses its eiiiciency due' to its becoming blunt, expose anew sharp edge which will have the same digging qualities as I A still further object of my invention is -to .enable the application of new laminations'on the tooth point so that the original point may be preserved for a considerable period of time.

It is also an object of my invention to provide a tooth point in which the laminations are of comparatively light, uniform section, insuring sound and solid castings withgood uniform heattreatment and, furthermore, on account of the light section and little metal, comparatively high quality alloy metal that may be expensive in price per pound can be used.

Further objects and advantages-ot my improvements will be more readily kapparent from the following description taken in connection with the attached' drawings, in which- Figure 1 is a plan view of my improved tooth point: A

Figure 2 is tion; i

Figure 3 is a cross section in the plane indicated by-the line 3--3 in Figure 2;

Figure 4 is a cross section in -theplane indicated by the line 4-4 lin Figure 2;

Figure 5 is aA composite iigure showing the a side elevation partially in secseveral parts in separated relation;

Figure 6 is a plan view of a modified form Figure 'l is a side elevation. of the modiiied form shown in Figure 6;

Figure 8 is a detail section of a portion of the form shown in Figures 6 and '1;

Figure 9 is a plan view of afurther modification; Figure 10 is a side elevation of the form shown 5 in Figure 9;

' Figure 11 is a sectional view on the plane indicated by the line II-II in Figure 10. and Figure 12 is a sectional view on the plane indicated I2-I2 in Figure 10. 10

Ihe dipper tooth, in Figures 1 to 5, inclusive, has a base I0 which may be vformed ina conventional mannerfor attachment to the tooth support upon the digging lip of the dipper. The part I2. constitutes .a renewable tooth point 15 which may be mounted on the base I0. The part I4 constitutes an additional renewable point car-` ried by the part I2. The complete dipper tooth may then be described as a laminated tooth point built up by attaching the parts I2 and I4 and 20 additional parts, if so desired, to the base I0. The sharpn digging edge I6 of the part I2 is normally concealed by the part I4 which, in turn, yhas a sharp digging edge I8. The purpose of this construction is to provide a-dipper tooth inv which,

after. the sharp digging edge has been impaired by Wear, a fresh sharp digging edge may be exposed by merely removing the worn tooth point without immediate replacement thereof. Thus, in the illustrated dipper tooth, after wear of the digging edge I8, the point I4 may be removed to expose the fresh digging edge I6 of the tooth point I2.

The part I0 which constitutes the base includes the divergent wings 20 tied together by the ver- -35 4tical web v22 extending at its rear to form an attaching tang 24 having an opening 26 for a connecting pin or bolt. The wings 20 have inwardly directed flanges 28 which cooperate with the tooth support in the usual manner.

The part I2 includes divergent wings 30 overlying the wings 20 of the base I0. The web 32 between the wings 3U has a wedge pin-receiving opening 34 and a cleft 36 is cut through the web 32 and extends across the opening 34. The nose 45 38 of the base I0 isbifurcated to receive the'web/ 32 of the part I2 and the biiurcated nose 38 is formed with wedge pin-receiving openings 43. The end 42 of the nose 38 may be somewhat reduced in`width to extend between the side webs 50 44 between the wings 30 of the part I2. The webs 44 may also have clefts or slits 48 to provide for a tight seat of the part I2 upon the base I 0. In order to hold the wings 33 against spreading' the central web 32 is extended to provide 55 rearwardly directed lugs 48 and the base I8 is provided wtih grooves extending from the bifurcation of the nose and terminating in undercut portions 58 which receive the lugs 48. Thus, the wings 28 provide shoulders 52 engaging the lugs 48 to hold the wings 38 of part I2 against spreading. The part I2 may be positioned on the base I8 and held in position by the insertion of the wedge pin 54 through the cooperating openings 48 and 34. The exterior part I4 includes divergent wings 56 overlapping the wings 38 of part l2, fastened thereto by pins or rivets 58. Ribs 68 are provided on the inner side of the wings 56 which fit into grooves 62 formed in the wings 38 and the lribs 68 terminate in lugs 64 received beneath the shoulders 66 of the wings 38. In the form thus far described, each of the overlying wings 38 and 56 extends at least far enough to protect from wear that portion of the inclined surface beneath it which carries wing-interlocking means typified by the part 48--58 or 64-66. It will be understood that the parts I2 and I4 are secured together by pins or rivets 58 before vbeing assembled upon the base I8. In use the outer part I4, as it becomes worn, automatically breaks away and exposes a new sharp edge.

Instead of pinning together the laminations of the tooth point, it may be desirable to weld the laminations together and Figures 6 to 8 show a welde'd laminated tooth point. The base 18 may have applied thereto a plurality of V-shaped laminations 12, 14, etc. The edges of the V- shaped lamination 12 may be chamfered, as indicated at 16, to provide a V-shaped groove in which the Welding material 18, may be deposited to securely attach the lamination 12 to the tooth body 18. In a. similar manner the laminated portion 14 may be welded as at 88. This laminated dipper tooth provides successive digging edges 82, 84, 86.

Figures 9 to 12 illustrate a further modiiication of a. laminated'dipper. tooth in which the several laminations are welded in place. The tooth body 98 has mounted thereon an inner V-shaped point 92 and, an outer AV-shaped point 94. The base 98 has a digging edge 96, the inner point 92 has a digging edge 98, and the outer point 94 has a digging edge |88.L The wings |82 of the point 92 are tapered and at'their rear ends are welded as at |84 to the base98. The wings |86 of the point 94 also taper rearwardly and are welded at their rear ends as at |88 to the point 92. Additional welding material is deposited at ||8 in recesses cut out at the junction between the wings k|82 of the point 92 and the point 94 is similarly welded to the point 92 by weld 2. Inorder to hold the parts against separation, due to llateral strains upon the tooth, the wings |82 may be f formed toI ,iit longitudinally into grooves formed in thebody 98 and the wings |86 are similarlyI formed tozfltinto grooves in the wings |82, asfshowniv by '-thesectional view of' Figures lland 12. 111

Various modifications" andv improvements may be resorted to without Idepartingfrom the spirit of the invention a`.s"expre`s'sed` in the appended .cl'aim's, in `which'the reference to dipper tooth is intended to include toothy or teeth dippers, scariflers, .drag buckets, ,gaderbiades-ana the like,

.l since my improvements'gare vapplicable to all such forms ofscraping or digging implements.

member constructed with a forward penetratingv edge and rearwardly divergent wings providing digging surfaces similar to those of said inner member; said Wings overlying, separably secured upon and approximately corresponding in width and length with the divergent digging surfaces of the inner member; and said auxiliary member thereby initially protecting the penetrating edge and said digging surfaces of said inner member and, when worn and discarded, exposing the penetrating edge and digging surfaces of the inner member for use. y

2. A tooth for excavating implements as described in claim l, in which meeting surfaces of the outer and inner members are provided, one with a reentrant portion and the other with a projecting portion separably interlocking with the reentrant portion and resisting relative movement in a direction lateral to the digging tooth.

3. A tooth for excavating implements as described in claim 1, in which Athe outer and inner members are provided with cooperating parts projecting one into the other and separably interlocking the said members from relativemovef ment in a direction perpendicular to the plane in which they meet.

4. A tooth for excavating implements as described in claim 1, in which the rearwardly extending surfaces of the outer and inner mem- ;j

bers are provided by wings on said members, and said wings, are constructed with interlocking portions separably securing said outer and inner members, through their said wings, against relative displacement; an outer Wing overlying and protecting from wear the interlocking portion of an inner wing.

5. A tooth for excavating implements as described in claim 1, in which the outer and inner members are constructed with overlying wings, and said wings are provided with projecting and reentrant portions cooperating to secure the members against relative lateral displacement, and with interlocking means separably connecting said wings against relative movement in a` direction perpendicular to the general plane of meeting of said wings.

6. A dipper tooth comprising a tooth base, a replaceable tooth point having wings and carried by said base, interlocking connections between the wings of said tooth point and said base to hold the wings of said point against spreading, an additional tooth point having wings and carried by said iirst tooth point and interlocking connections between the Wings of said tooth points to hold the wings of said second tooth point against spreading.

'1. A dipper toothcomprising a tooth body havingv divergent wings, a V-shaped tooth point carried by said base, a wedge pin for holding said tooth point to said base, a second V-shaped tooth point carried by said first tooth point and means for holding said second tooth point upon said first tooth point. l y fr. l. f DWIGHT GRAHAM. 

